Pump



March 1'1 1924. msw a H'. F. SMITH PUMP Filed Jan. 10. 1921 Fig.1. 155%., E:

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HARRY F. SETH, 0F DAYTQN, OHM), ASSIGNOR, BY MESNE ASSIGEM'FHUEE, 53f) GAS nnsnanon GOMPANY, 0F DAYTON, OHIO, A CORPORATION GE PUMP.

Application filed January 10, 1921.

To all whom it may concern Be it known that I, HARRY F. SMITH, a citizen of the United States of America, residing at Dayton, county of Montgomery, and State of Ohio, have invented certain new and use lullmprovements in Pumps, of which the following is a full, clear, and exact description.

This invention relates to pumps and more particularly to an improved -form of pump constructed to minimize mechanical -itriction and to substantially eliminate leakage.

One of the principal objects of the inven tion is to provide an improved form of pump in which the packings generally used are dispensed with, to thus minimize friction losses.

Another object of the invention is to provide a pump constructed to substantially prevent leakage of the fluid being acted upon, to thus give uniform delivery during operation of the pump.

Other objects and advantages of the invention will be apparent from the description set out below, when taken in connection with the appended drawing.

In the drawing, in which like characters of reference designate like parts throughout the several views thereof,

Fig. l is a vertical sectional view throu h a pum constituting a preferred embo iment 0' the invention; and

Fig. 2 is a corresponding sectional view through the same type of pump, the section .being along a plane at right angles to the plane of the section of Fig. 1.

The numeral 10 designates the pump barrel or cylinder, which has a piston or plum ger receiving bore 11. At one end the barrel 10 is enlarged, as at 12 to provide a chamber 13 which constitutes a continuation and enlargement of the passage or bore 11. Adjacent its other end the barrel 10 has an enlargement 15 formed integral therewith, which enlargement serves as the top or cover for a chamber 16 surrounding the lower or delivery end 17' of the ump barrel. The cover 15 may, if desired, e formed of a separate piece and attached to the pump barrel in any suitable "fashion. And, also, the enlargement 12 may, if it seems desirable, ,be formed separate and attached to the pump barrel in any suitable fashion, asby means or bolted flanges. The structure illustrated in the drawing as a preferred embodiment Serial NO. 4538336.

of the invention, is a small size pump adapt ed for the transfer of gases, and in pumps of this character it is mechanically expedient to cast the pump barrel, the enlargement 12 and the cover 15 as a single unitary structure.

Within the cylinder barrel, ad'acent the delivery end 17 thereof is a circular groove 20, which completely surrounds, and is connected to, the bore 11 of the barrel. @pening into the groove 20 is an inlet passage 22. As shown this inlet passage is formed within the cover 15; but this construction is not essential, as any other suitable method of connecting the inlet pipe 23 to the groove 20 may be utilized. Also opening through thecover 15 is an outlet passage 24, to which is connected an outlet or delivery pipe 25. In the construction illustrated the device is adapted for receiving gas from any suitable source through the inlet pipe 23 and delivering that gas under pressure to any desired place of use through the delivery pipe 25. The apparatus is also adapted to function as a vacuum pump, in which case the groove 20 would be connected to the vessel to be evacuated, and the outlet 24 need only open into the atmosphere. Or if desired this device may be used as an air compressor, in which case the inlet passage 20 need be connected only/to the atmosphere, and the outlet 24 connected, through the delivery pipe 25, to any suitable place of use or storage.

Closing the delivery end of the pump barrel is a disc valve 30 which is normally urged against the seat 31, formed upon the lower or delivery end of the cylinder barrel, by means of a spring 32, one end. of the spring bearing against the valve disc, and the other end against a spider 33, carried by bolts 34 which are in turn mounted within the lower face of the cover 15. Adjusting and retain-- mg nuts 35 are mounted upon the lower end of the bolts 34 by means of which the tension of the spring 32 may be varied, as de sired, to mal rc sufiiciently positive the seating of the valve disc against its seat. The chamber 16 is adapted to contain a sealing fluid 40 which is carried at such depth that it at all times covers the lower or delivery end of the cylinder barrel and the valve disc 30 closing the delivery end of the barrel. This construction is such that a fluid may readily pass from the cylinder barrel through the delivery end thereof into the lid I necting rod are 53 is provided I ucer gas, is' being chamber 16 and thus out throu h the delivery pipe, the valve 30 being eld away from its seat by the pressure of the outgoing fluid; but assage in the opposite direction of the flui being handled, that is from the chamber 16 into the pump barrel, is effectually prevented, not only by the valve disc itself, but by the sealing liquid 40. The chamber 16 and the cover 15 are held in assembled position by means of bolts 4.1, a tight joint being secured between the cooperating faces of the cover and chamber by means of suitable packing 42.

'Mounted within the bore 11 of the pump barrel is a piston or plunger 45 provided with a suitable number of oil grooves 46.

e upper end of the piston 45 is operatively rod 47, the other end of which is connected to the crank pin 48 carried by the crank disc 49, this disc being in turn rotatably mounted u on an operating shaft 50 which is driven rom any suitable power source.

A pin 51 is providedin the crank disc 49 for providing'positive attachment of the crank disc to the driving shaft 50. As

show'n particularly in Fig. 2, an opening 52 is provided in one side of the enlargement 12 for permitting ready access to the chamber 13, within which the crank disc and conpositioned. A cover plate for this opening, which is held in position by means of suitable bolts 54. The cover plate 53 is rovided with a passage 55 through which the shaft 50 passes, this opening 55 serving as a bearing to Iproperly support the shaft.

urmg operation of the device the chamber 13 contains a quantity of sealing liquid 60, preferably suflicient to cover the upper end of the piston atall times. An opening 61 normally closed by the cover 62 is rovided for introducing sealing liquid to the chamber 13 whenever necessary. .A guage 63 is connected to the chamber 13 to indicate the height of the sealing liquid therein. The sealing liquid within the chamber 13 and within the chamber 16 should vary in character according to the fluid or liquid beinghandled by the pump. Where air or gas, such as natural gas, city gas, or prohandled the sealing liquid may be a suitable form of oil. For other fluids the sealing liquid should be such that there will be no absorption of the fluid or chemical reaction between the fluid and liquid.

In operation of the device the piston 45 on the upstroke uncovers the inlet passage 20 and permits the inflow of fluid into the lower end of the pump barrel, below the end of the piston. At all times during upstroke of the piston the valve 30 is closed, so that back-flow into the pump barrel through the delivery end, from the chamber connected to one end of a connecting 16, cannot occur. Upon downstroke of the piston the initial part of the stroke causes the piston to cover over the inlet passage, afterwhich compression of the material within the lower end of the pump barrel occurs. As the piston continues its downward stroke the valve 30 is forced open and the fluid within the lower part of the pump barrel is forced out, through the sealing liquid 40 whence it passes through the outlet 24. The stroke of the piston is so regulated that at the completion of the downstroke the end thereof preferably extends a short distance beyond the valve seat 31. In other words the construction is such that upon down-stroke of the piston there is complete expulsion from the pump barrel of all the fluid therein, while upon upstroke the piston travels just far enough to uncover the inlet passage and connect this inlet passage with the lower or delivery end of the cylinder.

By means of this construction mechanical friction is minimized, for packed joints in connection with the moving parts are eliminated. In addition leakage is, practically eliminated. Upon upstroke of the piston the'delivery valve is sealed bymeans of the liquid 40. If for any untoward reason there should be a leakage through this valve back into the cylinder barrel, or any below the piston upwardly between the piston and cylinder, the'leaking fluid would be trapped in the inlet passage. The sealed upper end of the piston prevents leakage downwardly therealong into the groove 20. 7 While the form of mechanism, herein shown. and described constitutes a preferred form of embodimentof the invention, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

WVhat I claim is:

1. A pump of the character described comprisin in combination, a vertical cylinder barre having a piston receiving bore therein; an said cylinder barrel, a chamber in said en: largement forming a continuation of the cylinderbore. a sealing liquid within said chamber; a piston in said cylinder bore, and

spaced grooves around saidpiston, one end of the piston extending into said chamber, there being no packing glands surrounding said piston, the chamber in said enlargement being constructed to contain a sealingliquid which at all times covers the end of the piston within said chamber.

2. pump 'of the character described, compris ng, in combination, a cylinder barrel, having a piston receiving bore therein; an enlargement at one end of said cylinder barrel, a chamber in said enlargement formmg a continuation of the cylinder bore; a

leakage of the compressed fluid in the cylinder barrel,

enlargement at the upper end of memes a rotatable shaft journaled in the wall of said enlargement, a crank pin carried thereby, a connecting rod connecting the piston to the said crank pin; a valve seat surrounding the other end of said cylinder barrel and the piston receiving bore therein, a spring pressed valve cooperating with said seat; a

closed chamber surrounding the said last named end of said cylinder barrel and the.

valve cooperating therewith, a sealing liquid within said closed chamber at all times covering the end of said cylinder barrel within said closed chamber and the valve cooperating therewith, said closed chamber having an outlet passage within the wall thereofv above the level of the sealing liquid.

3. A gas pump comprising in combination, a vertical cylinder having a piston receiving bore therein; an integral enlargement at the upper end of said cylinder, a chamber in said enlargement forming a continuation of the cylinder bore;. a sealing liquid within said enlargement chamber at all time covering the end of the piston therein; a rotatable shaft j ournaled in the wall of said enlargement, a crank pin carried thereby, a connecting rod' connecting one end of the piston to said crank pin; a horizontal valve seat surrounding the lower end of said cylinder and the piston receiving bore therein, a spring pressed valve cooperating with said seat; a reciprocable piston within the cylinder bore constructed to extend beyond the valve seat upon completion of its stroke in one direction; a closed chamber surrounding the said lower end of said cylinder and the valve cooperating therewith, a sealing liquid within said closed chamber at all times covering the end of said cylinder within said closed chamber and the valve cooperating therewith, the wall of said closed chamber havin an outlet passage therein, so positioned that it is at all times above the level of the sealing liquid within said chamber.

In testimony whereof I hereto aflix my signature.

HARRY E. SMITH. Witnesses:

CHARLES E. GREENE, B. H. SMITH. 

